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#include <bits/stdc++.h>


#define FOR(i, a, b) for(int i = (a); i < (b); ++i)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)
#define VAR(v, i) __typeof(i) v=(i)
#define FORE(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define all(v) (v).begin(),(v).end()

#define PII pair<int,int>
#define mp make_pair
#define st first
#define nd second
#define pb push_back
#define lint long long int
#define VI vector<int>

#define debug(x) {cout <<#x <<" = " <<x <<endl; }
#define debug2(x,y) {cerr <<#x <<" = " <<x << ", "<<#y<<" = "<< y <<endl; } 
#define debug3(x,y,z) {cerr <<#x <<" = " <<x << ", "<<#y<<" = "<< y << ", " << #z << " = " << z <<endl; } 
#define debugv(x) {{cout <<#x <<" = "; FORE(itt, (x)) cerr <<*itt <<", "; cerr <<endl; }}
#define debugt(t,n) {{cerr <<#t <<" = "; FOR(it,0,(n)) cerr <<t[it] <<", "; cerr <<endl; }}

#define make( x) int (x); scanf("%d",&(x));
#define make2( x, y) int (x), (y); scanf("%d%d",&(x),&(y));
#define make3(x, y, z) int (x), (y), (z); scanf("%d%d%d",&(x),&(y),&(z));
#define make4(x, y, z, t) int (x), (y), (z), (t); scanf("%d%d%d%d",&(x),&(y),&(z),&(t));
#define makev(v,n) VI (v); FOR(i,0,(n)) { make(a); (v).pb(a);} 
#define IOS ios_base::sync_with_stdio(0)
#define HEAP priority_queue

#define read( x) scanf("%d",&(x));
#define read2( x, y) scanf("%d%d",&(x),&(y));
#define read3(x, y, z) scanf("%d%d%d",&(x),&(y),&(z));
#define read4(x, y, z, t) scanf("%d%d%d%d",&(x),&(y),&(z),&(t));
#define readv(v,n) FOR(i,0,(n)) { make(a); (v).pb(a);}
#define jeb() fflush(stdout);

using namespace std;
const int max_n = 3e5 + 5;

const int INF = 1e9 + 7;

int n;
VI v;
map<int,int> nines;

lint get_val(int nr, int zer, int suf) {
		lint ans = nr;
		while (zer--) {
			ans = ans * 10LL;
			if (ans > INF) return INF;
		}
		if (suf == -1) return ans;
		int nsuf = suf;
		while (nsuf > 0) {
			ans *= 10LL;
			nsuf /= 10;
			if (ans > INF) return INF;
		}
		ans += suf;
		if (ans > INF) return INF;
		return ans;
}

pair<PII,int> inc(int nr, int zer, int suf) {
	if (suf == -1) {
		if (zer == 0) return {{nr + 1,0},-1};
		return {{nr,zer-1},1};
	}
	if (nines.find(suf) == nines.end()) {
		return {{nr,zer},suf+1};
	}
	if (zer == 0) {
		return {{nr+1,nines[suf]},-1};
	} 
	return {{nr,zer-1},suf+1};
}

int num_len(int k) {
	if (k == 0) return 1;
	int ans = 0;
	while (k) {
		ans++;
		k /= 10;
	}
	return ans;
}

int len(int nr, int zer, int suf) {
	int ans = zer;
	ans += num_len(nr);
	if (suf == -1) return ans;
	ans += num_len(suf);
	return ans;
}


int is_pref(int nr, int zer, int suf, int kto) {
	int l = num_len(kto);
	VI digs;
	int cnr = nr;
	while (cnr) {
		digs.pb(cnr%10);
		cnr /= 10;
	}
	reverse(all(digs));
	while (zer && digs.size() < l) {
		digs.pb(0);
		zer--;
	}
	VI sdigs;
	while (suf) {
		sdigs.pb(suf%10);
		suf /= 10;
	}
	reverse(all(sdigs));
	FOR(i,0,sdigs.size()) digs.pb(sdigs[i]);
	if (digs.size() < l) return -1000;
	VI kdigs;
	while (kto) {
		kdigs.pb(kto%10);
		kto /= 10;
	}
	reverse(all(kdigs));
	FOR(i,0,l) {
		if (kdigs[i] < digs[i]) return -1;
		if (kdigs[i] > digs[i]) return 1;
	}
	return 0;
}



int main() {
	lint act = 0;
	int cnt = 0;
	while (act < INF) {
		cnt++;
		act = 10LL * act + 9;
		nines[act] = cnt;
	}
	read(n);
	readv(v, n);
	lint ans = 0;

	int active = v[0];
	int zer = 0;
	int suf = -1;

	FOR(i,1,n) {
//	debug(ans);
//		debug3(active, zer, suf);
		lint w = get_val(active, zer, suf);
//		debug(w);
		if (w < v[i]) {
			active = v[i]; zer = 0; suf = -1;
			continue;
		} else {
			pair<PII, int> dupa = inc(active, zer, suf);
			int is_p = is_pref(dupa.st.st, dupa.st.nd, dupa.nd, v[i]);
//			debug(is_p);
			if (is_p  == 0) {
				active = dupa.st.st;
				zer = dupa.st.nd;
				suf = dupa.nd;
				ans += len(active, zer, suf) - num_len(v[i]);
			} else if (is_p == -1) {
				int lv = num_len(v[i]);
				int l = len(dupa.st.st, dupa.st.nd, dupa.nd);
				ans += l-lv+1;
				active = v[i]; zer = l-lv+1; suf = -1;
			} else if (is_p == 1) {
				int lv = num_len(v[i]);
				int l = len(dupa.st.st, dupa.st.nd , dupa.nd);
				ans += l-lv;
				active = v[i]; zer = l-lv; suf = -1;
			}
		}
	}

//		debug3(active, zer, suf);

	printf("%lld\n", ans);
}